7 segment led counter

yeyo2129 · December 4, 2017, 3:04am

Hey. I got a project with a 7 segment leds and 3 buttons to do a counter. Up button, adds 1 number and displays it with LEDs; Down Button susbstracts 1 number, if number is 9 and click up, it should go to 0, if number is 0 and click down, it should go to nine, finally A Button resets to 0.

I ve been coding all afternoon and finally got it to compile, I upload it to my Arduino but it won't work. It just displays the 0 and nothing happens when I click up or down button, I know they work because I ve used them for other programs

Could some one take a look on my code and tell me whats wrong, ill be very thankful since its my final project !!!1

Thanks in advance

int switchUpPin = 5;
int switchDownPin = 7;
int counter = 0;
int buttonUpState = 0;
int lastButtonUpState = 0;
int buttonDownState = 0;
int lastButtonDownState = 0;


void displayZero() {
  Serial.println("zero");
  digitalWrite (11, true);
  digitalWrite (13, true);
  digitalWrite (8, true);
  digitalWrite (9, true);
  digitalWrite (12, true);
  digitalWrite (A0, true);
}


void setup()
{
  Serial.begin(9600);

  Serial.begin(9600);
  pinMode(A0, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(switchUpPin, INPUT_PULLUP);
  pinMode(switchDownPin, INPUT_PULLUP);
}
void loop() {
  displayZero();
  
  buttonUpState = digitalRead(switchUpPin);
  buttonDownState = digitalRead(switchDownPin);

  //Detecting button press and getting the button status
  //Do this for the button up
  if (buttonUpState != lastButtonUpState)
  {
    if (buttonUpState == HIGH)
    {
      //Reset the counter to -1
      if (counter == 9)
      {
        counter = +1;
      }
      //Increase the counter by 1
      counter++;
      //Print the counter to the console and calling the function
      Serial.println(counter);
      changeNumber(counter);
      //Delaying by 250 ms
      delay(250);
    }
    else
    {
      Serial.println("OFF");
    }
    //Delay to avoid button bouncing
    delay(50);
  }

  //Do this for the button down
  if (buttonDownState != lastButtonDownState)
  {
    if (buttonDownState == HIGH)
    {
      //Set the counter to 10
      if (counter == 0)
      {
        counter = 10;
      }
      //Decreases the counter by 1
      counter--;
      ////Print the counter to the console and calling the function
      Serial.println(counter);
      changeNumber(counter);
      //Delaying by 250 ms
      delay(250);
    }
    else
    {
      Serial.println("OFF");
    }
    //Delay to avoid button bouncing
    delay(50);
  }
  //Calling the function changeNumber with the arg counter
  changeNumber(counter);
}

//The function to display the numbers
void changeNumber(int buttonPress)
{
  switch (buttonPress)
  {
    //number 0
    case 0:

      displayZero();
      break;
    //number 1
    case 1:
      Serial.println("one");
      digitalWrite (8, true);
      digitalWrite (11, true);
    case 2:
      Serial.println("two");
      digitalWrite (8, true);
      digitalWrite (10, true);
      digitalWrite (12, true);
      digitalWrite (A0, true);
      digitalWrite (13, true);
      break;
    case 3:
      Serial.println("three");
      digitalWrite (8, true);
      digitalWrite (12, true);
      digitalWrite (13, true);
      digitalWrite (A0, true);
      digitalWrite (10, true);
      break;
    case 4:
      Serial.println("four");
      digitalWrite (9, true);
      digitalWrite (8, true);
      digitalWrite (10, true);
      digitalWrite (11, true);
      break;
    case 5:
      Serial.println("five");
      digitalWrite (A0, true);
      digitalWrite (9, true);
      digitalWrite (10, true);
      digitalWrite (11, true);
      digitalWrite (13, true);
      break;
    case 6:
      Serial.println("six");
      digitalWrite (A0, true);
      digitalWrite (9, true);
      digitalWrite (10, true);
      digitalWrite (11, true);
      digitalWrite (12, true);
      digitalWrite (12, true);
      break;
    case 7:
      Serial.println("seven");
      digitalWrite (A0, true);
      digitalWrite (8, true);
      digitalWrite (10, true);
      digitalWrite (11, true);

      break;
    case 8:
      Serial.println("eight");
      digitalWrite (8, true);
      digitalWrite (9, true);
      digitalWrite (11, true);
      digitalWrite (10, true);
      digitalWrite (12, true);
      digitalWrite (A0, true);
      digitalWrite (13, true);
      break;
    case 9:
      Serial.println("nine");
      digitalWrite (A0, true);
      digitalWrite (9, true);
      digitalWrite (8, true);
      digitalWrite (10, true);
      digitalWrite (11, true);
      break;
  }
}

anon57585045 · December 4, 2017, 3:20am

Where do you ever clear the segments? If you follow a 0 with a 1, you will still see a 0 unless you clear them.

Jimmus · December 4, 2017, 3:22am

Also, your button logic is backwards. If you're going to use internal pull-up resistors, button pressed = LOW.

anon57585045 · December 4, 2017, 3:24am

Which brings up the subject of your schematic.

TonyWilk · December 4, 2017, 3:31am

Find out what your program is doing by adding more Serial.print messages.

You say it does nothing... nothing on the serial monitor ?

try adding something like:

  //Detecting button press and getting the button status
  //Do this for the button up
  if (buttonUpState != lastButtonUpState)
  {
     Serial.print("we got here!");

Yours,
TonyWilk

P.S. you might like to look at where you change the value of lastButtonUpState...

yeyo2129 · December 4, 2017, 3:35am

aarg:
Where do you ever clear the segments? If you follow a 0 with a 1, you will still see a 0 unless you clear them.

how can id do it? im so sorry of bothering you with my stupid questions. Im a complete noob in this topics, I really hope you can help me

gfvalvo · December 4, 2017, 3:54am

yeyo2129:
how can id do it?

Every 'case' in your 'switch (buttonPress)' construct should have 7 'digitalWrite()' function calls in it. Some will be 'digitalWrite(pin, LOW)' and some will be 'digitalWrite(pin, HIGH)', but there should always be 7 of them (i.e. one for each segment). And, see how I used 'LOW' and 'HIGH', not 'true' and 'false'. Those are boolean values.

Why do you have a 'displayZero()' function when your 'changeNumber()' function can already display ALL the numbers. Why not just use it?

Finally, the 'switch' construct is kind of a crude way of doing this. An array of bytes with one bit assigned to each segment would be much less aesthetically objectionable.

yeyo2129 · December 4, 2017, 4:17am

gfvalvo:
Every 'case' in your 'switch (buttonPress)' construct should have 7 'digitalWrite()' function calls in it. Some will be 'digitalWrite(pin, LOW)' and some will be 'digitalWrite(pin, HIGH)', but there should always be 7 of them (i.e. one for each segment). And, see how I used 'LOW' and 'HIGH', not 'true' and 'false'. Those are boolean values.

Why do you have a 'displayZero()' function when your 'changeNumber()' function can already display ALL the numbers. Why not just use it?

Finally, the 'switch' construct is kind of a crude way of doing this. An array of bytes with one bit assigned to each segment would be much less aesthetically objectionable.

Just did it and still not working

LarryD · December 4, 2017, 4:18am

Show us a good schematic of your circuit.
Show us a good image of your wiring.

Always show us your ‘current’ compete sketch.
Use CTRL T to format the sketch.
Please use code tags.
Use the </> icon in the posting menu.

[code] Paste sketch here. [/code]

yeyo2129 · December 4, 2017, 4:22am

Here is the code with the correction

/Initialize the 7 segment pins
int A = 3;
int B = 2;
int C = 4;
int D = 5;
int DP = 7;
int E = 6;
int F = 8;
int G = 9;

//Initialize the push buttons pins, push buttons states, and the counter
int switchUpPin = 13;
int switchDownPin = 12;
int counter = 0;
int buttonUpState = 0;
int lastButtonUpState = 0;
int buttonDownState = 0;
int lastButtonDownState = 0;

void setup()
{
  Serial.begin(9600);

  pinMode(A, OUTPUT);
  pinMode(B, OUTPUT);
  pinMode(C, OUTPUT);
  pinMode(D, OUTPUT);
  pinMode(E, OUTPUT);
  pinMode(F, OUTPUT);
  pinMode(G, OUTPUT);
  pinMode(DP, OUTPUT);

  //Start with the deceimal point off
  digitalWrite(DP , HIGH);
}

void loop()
{
  //Getting the reads from the buttons
  buttonUpState = digitalRead(switchUpPin);
  buttonDownState = digitalRead(switchDownPin);

  //Detecting button press and getting the button status
  //Do this for the button up
  if (buttonUpState != lastButtonUpState)
  {
    if (buttonUpState == HIGH)
    {
      //Reset the counter to -1
      if (counter == 9)
      {
        counter = -1;
      }
      //Increase the counter by 1
      counter++;
      //Print the counter to the console and calling the function
      Serial.println(counter);
      changeNumber(counter);
      //Delaying by 250 ms
      delay(250);
    }
    else
    {
      Serial.println("OFF");
    }
    //Delay to avoid button bouncing
    delay(50);
  }

  //Do this for the button down
  if (buttonDownState != lastButtonDownState)
  {
    if (buttonDownState == HIGH)
    {
      //Set the counter to 10
      if (counter == 0)
      {
        counter = 10;
      }
      //Decreases the counter by 1
      counter--;
      ////Print the counter to the console and calling the function
      Serial.println(counter);
      changeNumber(counter);
      //Delaying by 250 ms
      delay(250);
    }
    else
    {
      Serial.println("OFF");
    }
    //Delay to avoid button bouncing
    delay(50);
  }
  //Calling the function changeNumber with the arg counter
  changeNumber(counter);
}

//The function to display the numbers
void changeNumber(int buttonPress)
{
  switch (buttonPress)
  {
    //number 0
    case 0:
      digitalWrite(A, LOW);
      digitalWrite(B, LOW);
      digitalWrite(C, LOW);
      digitalWrite(D, LOW);
      digitalWrite(E, LOW);
      digitalWrite(F, LOW);
      digitalWrite(G, HIGH);
      break;
    //number 1
    case 1:
      digitalWrite(A, HIGH);
      digitalWrite(B, LOW);
      digitalWrite(C, LOW);
      digitalWrite(D, HIGH);
      digitalWrite(E, HIGH);
      digitalWrite(F, HIGH);
      digitalWrite(G, HIGH);
      break;
    //number 2
    case 2:
      digitalWrite(A, LOW);
      digitalWrite(B, LOW);
      digitalWrite(C, HIGH);
      digitalWrite(D, LOW);
      digitalWrite(E, LOW);
      digitalWrite(F, HIGH);
      digitalWrite(G, LOW);
      break;
    //number 3
    case 3:
      digitalWrite(A, LOW);
      digitalWrite(B, LOW);
      digitalWrite(C, LOW);
      digitalWrite(D, LOW);
      digitalWrite(E, HIGH);
      digitalWrite(F, HIGH);
      digitalWrite(G, LOW);
      break;
    //number 4
    case 4:
      digitalWrite(A, HIGH);
      digitalWrite(B, LOW);
      digitalWrite(C, LOW);
      digitalWrite(D, HIGH);
      digitalWrite(E, HIGH);
      digitalWrite(F, LOW);
      digitalWrite(G, LOW);
      break;
    //number 5
    case 5:
      digitalWrite(A, LOW);
      digitalWrite(B, HIGH);
      digitalWrite(C, LOW);
      digitalWrite(D, LOW);
      digitalWrite(E, HIGH);
      digitalWrite(F, LOW);
      digitalWrite(G, LOW);
      break;
    //number 6
    case 6:
      digitalWrite(A, LOW);
      digitalWrite(B, HIGH);
      digitalWrite(C, LOW);
      digitalWrite(D, LOW);
      digitalWrite(E, LOW);
      digitalWrite(F, LOW);
      digitalWrite(G, LOW);
      break;
    //number 7
    case 7:
      digitalWrite(A, LOW);
      digitalWrite(B, LOW);
      digitalWrite(C, LOW);
      digitalWrite(D, HIGH);
      digitalWrite(E, HIGH);
      digitalWrite(F, HIGH);
      digitalWrite(G, HIGH);
      break;
    //number 8
    case 8:
      digitalWrite(A, LOW);
      digitalWrite(B, LOW);
      digitalWrite(C, LOW);
      digitalWrite(D, LOW);
      digitalWrite(E, LOW);
      digitalWrite(F, LOW);
      digitalWrite(G, LOW);
      break;
    //number 9
    case 9:
      digitalWrite(A, LOW);
      digitalWrite(B, LOW);
      digitalWrite(C, LOW);
      digitalWrite(D, HIGH);
      digitalWrite(E, HIGH);
      digitalWrite(F, LOW);
      digitalWrite(G, LOW);
      break;
  }
}

LarryD · December 4, 2017, 4:27am

You never update lastButtonUpState or lastButtonDownState

yeyo2129 · December 4, 2017, 4:29am

larryd:
You never update lastButtonUpState or lastButtonDownState

What do you mena with that? How do I do it? Im really sorry and I apologize, its my first time into programming and I am a complete stupid, hope you can understand

LarryD · December 4, 2017, 4:42am

if (buttonUpState != lastButtonUpState)
  {
     lastButtonUpState = buttonUpState;  // < - - - <<<

     if (buttonUpState == HIGH)
    {

.
.
.

if (buttonDownState != lastButtonDownState)
  {
     lastButtonDownState = buttonDownState;  // < - - - <<<

     if (buttonDownState == HIGH)
    {

Did you author this sketch?

yeyo2129 · December 4, 2017, 4:49am

larryd:

if (buttonUpState != lastButtonUpState)

{
lastButtonUpState = buttonUpState; // < - - - <<<

if (buttonUpState == HIGH)
{

.
.
.

if (buttonDownState != lastButtonDownState)
{
lastButtonDownState = buttonDownState; // < - - - <<<

if (buttonDownState == HIGH)
{






Did you author this sketch?

yes, I just corrected with what you told me

LarryD · December 4, 2017, 4:52am

What was the result of your changes?

Did you write this sketch?

yeyo2129 · December 4, 2017, 4:57am

larryd:
What was the result of your changes?

Did you write this sketch?

No results, still the same. The leds display a 0 but when I click the buttons nothing happens. Is there anything wrong in the code?

LarryD · December 4, 2017, 5:15am

Did you write this sketch?

Show us a good schematic of your circuit.
Show us a good image of your wiring.

What is printed on the serial monitor with this version?

//Initialize the 7 segment pins
int A = 3;
int B = 2;
int C = 4;
int D = 5;
int DP = 7;
int E = 6;
int F = 8;
int G = 9;

//Initialize the push buttons pins, push buttons states, and the counter
int switchUpPin = 13;
int switchDownPin = 12;
int counter = 0;
int buttonUpState = 0;
int lastButtonUpState = 0;
int buttonDownState = 0;
int lastButtonDownState = 0;

void setup()
{
  Serial.begin(9600);

  pinMode(A, OUTPUT);
  pinMode(B, OUTPUT);
  pinMode(C, OUTPUT);
  pinMode(D, OUTPUT);
  pinMode(E, OUTPUT);
  pinMode(F, OUTPUT);
  pinMode(G, OUTPUT);
  pinMode(DP, OUTPUT);

  //Start with the deceimal point off
  digitalWrite(DP , HIGH);
}

void loop()
{
  //Getting the reads from the buttons
  buttonUpState = digitalRead(switchUpPin);
  buttonDownState = digitalRead(switchDownPin);

  //Detecting button press and getting the button status
  //Do this for the button up
  if (buttonUpState != lastButtonUpState)
  {
    lastButtonUpState = buttonUpState;
    if (buttonUpState == HIGH)
    {
      //Reset the counter to -1
      if (counter == 9)
      {
        counter = -1;
      }
      //Increase the counter by 1
      counter++;
      //Calling the function changeNumber with the arg counter
      changeNumber(counter);
    }
  }

  //Do this for the button down
  if (buttonDownState != lastButtonDownState)
  {
    lastButtonDownState = buttonDownState;
    if (buttonDownState == HIGH)
    {
      //Set the counter to 10
      if (counter == 0)
      {
        counter = 10;
      }
      //Decreases the counter by 1
      counter--;
      //Calling the function changeNumber with the arg counter
      changeNumber(counter);
     }
  }
}

//The function to display the numbers
void changeNumber(int buttonPress)
{
  switch (buttonPress)
  {
    //number 0
    case 0:
      Serial.println("0");
      digitalWrite(A, LOW);
      digitalWrite(B, LOW);
      digitalWrite(C, LOW);
      digitalWrite(D, LOW);
      digitalWrite(E, LOW);
      digitalWrite(F, LOW);
      digitalWrite(G, HIGH);
      break;
    //number 1
    case 1:
      Serial.println("1");
      digitalWrite(A, HIGH);
      digitalWrite(B, LOW);
      digitalWrite(C, LOW);
      digitalWrite(D, HIGH);
      digitalWrite(E, HIGH);
      digitalWrite(F, HIGH);
      digitalWrite(G, HIGH);
      break;
    //number 2
    case 2:
      Serial.println("2");
      digitalWrite(A, LOW);
      digitalWrite(B, LOW);
      digitalWrite(C, HIGH);
      digitalWrite(D, LOW);
      digitalWrite(E, LOW);
      digitalWrite(F, HIGH);
      digitalWrite(G, LOW);
      break;
    //number 3
    case 3:
      Serial.println("3");
      digitalWrite(A, LOW);
      digitalWrite(B, LOW);
      digitalWrite(C, LOW);
      digitalWrite(D, LOW);
      digitalWrite(E, HIGH);
      digitalWrite(F, HIGH);
      digitalWrite(G, LOW);
      break;
    //number 4
    case 4:
      Serial.println("4");
      digitalWrite(A, HIGH);
      digitalWrite(B, LOW);
      digitalWrite(C, LOW);
      digitalWrite(D, HIGH);
      digitalWrite(E, HIGH);
      digitalWrite(F, LOW);
      digitalWrite(G, LOW);
      break;
    //number 5
    case 5:
      Serial.println("5");
      digitalWrite(A, LOW);
      digitalWrite(B, HIGH);
      digitalWrite(C, LOW);
      digitalWrite(D, LOW);
      digitalWrite(E, HIGH);
      digitalWrite(F, LOW);
      digitalWrite(G, LOW);
      break;
    //number 6
    case 6:
      Serial.println("6");
      digitalWrite(A, LOW);
      digitalWrite(B, HIGH);
      digitalWrite(C, LOW);
      digitalWrite(D, LOW);
      digitalWrite(E, LOW);
      digitalWrite(F, LOW);
      digitalWrite(G, LOW);
      break;
    //number 7
    case 7:
      Serial.println("7");
      digitalWrite(A, LOW);
      digitalWrite(B, LOW);
      digitalWrite(C, LOW);
      digitalWrite(D, HIGH);
      digitalWrite(E, HIGH);
      digitalWrite(F, HIGH);
      digitalWrite(G, HIGH);
      break;
    //number 8
    case 8:
      Serial.println("8");
      digitalWrite(A, LOW);
      digitalWrite(B, LOW);
      digitalWrite(C, LOW);
      digitalWrite(D, LOW);
      digitalWrite(E, LOW);
      digitalWrite(F, LOW);
      digitalWrite(G, LOW);
      break;
    //number 9
    case 9:
      Serial.println("9");
      digitalWrite(A, LOW);
      digitalWrite(B, LOW);
      digitalWrite(C, LOW);
      digitalWrite(D, HIGH);
      digitalWrite(E, HIGH);
      digitalWrite(F, LOW);
      digitalWrite(G, LOW);
      break;
  }
}

LarryD · December 4, 2017, 5:22am

It is not a good idea to use single letter variable names.
int A = 3;
Change to:
int segA = 3;
Use the correct 'type' for your variables.
int segA = 3;
Change to:
byte segA = 3;
A variable that will not change should be a constant.
byte segA = 3;
Change to:
const byte segA = 3;

yeyo2129 · December 4, 2017, 5:24am

larryd:
It is not a good idea to use single letter variable names.
int A = 3;
Change to:
int segA = 3;
Use the correct 'type' for your variables.
int segA = 3;
Change to:
byte segA = 3;
A variable that will not change should be a constant.
byte segA = 3;
Change to:
const byte segA = 3;

will that work? I can't really understand

yeyo2129 · December 4, 2017, 5:30am

I changed it.

This is my new code and still won't work

int switchUpPin = 5;
int switchDownPin = 7;
int counter = 0;
int buttonUpState = 0;
int lastButtonUpState = 0;
int buttonDownState = 0;
int lastButtonDownState = 0;


void displayZero() {
  Serial.println("zero");
  digitalWrite (11, HIGH);
  digitalWrite (13, HIGH);
  digitalWrite (8, HIGH);
  digitalWrite (9, HIGH);
  digitalWrite (12, HIGH);
  digitalWrite (A0, HIGH);
  digitalWrite(10, LOW);
}


void setup()
{
  Serial.begin(9600);

  Serial.begin(9600);
  pinMode(A0, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(switchUpPin, INPUT_PULLUP);
  pinMode(switchDownPin, INPUT_PULLUP);
}
void loop() {
  displayZero();

  buttonUpState = digitalRead(switchUpPin);
  buttonDownState = digitalRead(switchDownPin);

  //Detecting button press and getting the button status
  //Do this for the button up
  if (buttonUpState != lastButtonUpState)
  {
    if (buttonUpState == LOW)
    {
      //Reset the counter to -1
      if (counter == 9)
      {
        counter = -1;
      }
      //Increase the counter by 1
      counter++;
      //Print the counter to the console and calling the function
      Serial.println(counter);
      changeNumber(counter);
      //Delaying by 250 ms
      delay(250);
    }
    else
    {
      Serial.println("OFF");
    }
    //Delay to avoid button bouncing
    delay(50);
  }

  //Do this for the button down
  if (buttonDownState != lastButtonDownState)
  {
    if (buttonDownState == LOW)
    {
      //Set the counter to 10
      if (counter == 0)
      {
        counter = 10;
      }
      //Decreases the counter by 1
      counter--;
      ////Print the counter to the console and calling the function
      Serial.println(counter);
      changeNumber(counter);
      //Delaying by 250 ms
      delay(250);
    }
    else
    {
      Serial.println("OFF");
    }
    //Delay to avoid button bouncing
    delay(50);
  }
  //Calling the function changeNumber with the arg counter
  changeNumber(counter);
}

//The function to display the numbers
void changeNumber(int buttonPress)
{
  switch (buttonPress)
  {
    //number 0
    case 0:
      digitalWrite(A0, LOW);
      digitalWrite(8, LOW);
      digitalWrite(9, LOW);
      digitalWrite(11, LOW);
      digitalWrite(12, LOW);
      digitalWrite(13, LOW);
      digitalWrite(10, HIGH);
      break;
    //number 1
    case 1:
      Serial.println("one");
      digitalWrite (8, LOW);
      digitalWrite (11, LOW);
      digitalWrite(A0, HIGH);
      digitalWrite(9, HIGH);
      digitalWrite(10, HIGH);
      digitalWrite(12, HIGH);
      digitalWrite(13, HIGH);
    case 2:
      Serial.println("two");
      digitalWrite (8, LOW);
      digitalWrite (10, LOW);
      digitalWrite (12, LOW);
      digitalWrite (A0, LOW);
      digitalWrite (13, LOW);
      digitalWrite(9, HIGH);
      digitalWrite(11, HIGH);
      break;
    case 3:
      Serial.println("three");
      digitalWrite (8, LOW);
      digitalWrite (12, LOW);
      digitalWrite (13, LOW);
      digitalWrite (A0, LOW);
      digitalWrite (10, LOW);
      digitalWrite(9, HIGH);
      digitalWrite(11, HIGH);
      break;
    case 4:
      Serial.println("four");
      digitalWrite (9, LOW);
      digitalWrite (8, LOW);
      digitalWrite (10, LOW);
      digitalWrite (11, LOW);
      digitalWrite(A0, HIGH);
      digitalWrite(12, HIGH);
      digitalWrite(13, HIGH);
      break;
    case 5:
      Serial.println("five");
      digitalWrite (A0, LOW);
      digitalWrite (9, LOW);
      digitalWrite (10, LOW);
      digitalWrite (11, LOW);
      digitalWrite (13, LOW);
      digitalWrite(8, HIGH);
      digitalWrite(12, HIGH);
      break;
    case 6:
      Serial.println("six");
      digitalWrite (A0, LOW);
      digitalWrite (9, LOW);
      digitalWrite (10, LOW);
      digitalWrite (11, LOW);
      digitalWrite (12, LOW);
      digitalWrite (12, LOW);
      digitalWrite(8, HIGH);

      break;
    case 7:
      Serial.println("seven");
      digitalWrite (A0, LOW);
      digitalWrite (8, LOW);
      digitalWrite (10, LOW);
      digitalWrite (11, LOW);
      digitalWrite(9, HIGH);
      digitalWrite(12, HIGH);
      digitalWrite(13, HIGH);

      break;
    case 8:
      Serial.println("eight");
      digitalWrite (8, LOW);
      digitalWrite (9, LOW);
      digitalWrite (11, LOW);
      digitalWrite (10, LOW);
      digitalWrite (12, LOW);
      digitalWrite (A0, LOW);
      digitalWrite (13, LOW);
      break;
    case 9:
      Serial.println("nine");
      digitalWrite (A0, LOW);
      digitalWrite (9, LOW);
      digitalWrite (8, LOW);
      digitalWrite (10, LOW);
      digitalWrite (11, LOW);
      digitalWrite(12, HIGH);
      digitalWrite(13, HIGH);
      break;
  }
}

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